US2691288A - Padlock - Google Patents

Description

. Oct. 12, 1954 G. D. cHlLDs 2,691,288

PADLOCK Filed NOV. 26. 1951 irma/fr Patented Oct. 12, 1954 PADLocK Gary D. Childs, Burbank, Calif., assigner to Schlage Lock Company, a corporation Application November 26, 1951, Serial No. 258,227

(Cl. 'l0-38) 7 Claims.

My invention relates to locks of the sort in which a shackle is provided for interengagement with a device to be locked and in which the shackle is movable between locked and unlocked positions under the control of a key.

It is an object of my invention to provide a padlock diicult to tamper with but secure when in locked condition.

Another object of my invention is to provide a padlock readily manufactured with a number of substantially standard components.

A still further object of my invention is to provide a padlock which gives little or no external indication of the nature of its internal mechanism.

A further object of the invention is to provide a padlock economical to manufacture with usual production machinery.

A still further object of my invention is in general to provide an improved padlock.

Further objects together with the foregoing are attained in the embodiment of my invention described in the accompanying description and illustrated in the accompanying drawings in which:

Figure l is a cross-section on a generally transverse plane through a padlock constructed in accordance with my invention with the lock in its closed or locked condition.

Figure 2 is a view similar to Figure l, but showing the padlock in an unlocked condition.

Figure 3 is a cross-section, the planes of which are indicated by the lines 3 3 of Figure 1.

Figure 4 is a cross-section, the planes of which are indicated by the lines 4-4 of Figure 2.

Figure 5 is a fragmentary view showing in cross-section, the plane of which is indicated by the lines 5 5 of Figure 1, the detailed construction of part of the shell and lock unit.

Figure 6 is an exploded View in perspective of the shell.

While the padlock of my invention can readily be embodied in a number of diierent forms and can be especially adapted to various circumstances, it has been successfully embodied and operated in the particular form disclosed herein. In this arrangement, there is provided a body 6 preferably fabricated or machined from a block of solid material, such as brass, that provides a satisfactory external appearance and is durable yet readily worked. The body 6 is substantially rectangular in one cross-section and is elliptical in a transverse cross-section. The body is distinguished by an upper face 'l and a parallel lower face 8. The upper face 1 is pierced to form a pair of parallel recesses 9 and Il, preferably by boring or drilling into the material of the body. The recess e is relatively shallow whereas the recess l l is relatively deep.

Disposed within the recesses in one position is a shackle I2 preferably fabricated of a rod of metal bent into substantially a U or J shape, one leg i3 of the shackle being somewhat shorter than the other leg le thereof. The leg It is slidably received within the recess i I and is likewise rotatable therein. The extent of movement of the shackle with respect to the body E is limited by a detent pin l-S which has a rounded end in engagement with a iiat Il milled or otherwise provided on the elongated leg I4. The pin It is also receivable in a circumferential groove I3 formed in the leg Iii. A spring I9 abuts the lower end of the leg It and likewise seats in the lower end of the recess l i. A drain hole 2| is provided for discharge of any material which might inadvertently gain access to the interior of the body and also provides for 'the introduction of oil for the shackle I2.

The detent pin it is preferably positioned in the interior portion of a through bore 22 initially provided in the body and subsequently partly closed by a plug 23 nished to match the exterior of the body so that it is normally invisible. With this structure as so far described, the spring i9 normally projects the shackle l2 into the position shown in Figure 2, the projection being in substantially a rectilinear path since the iiat face l'l rides on the detent i6 and precludes rotation of the shackle. When the shackle is in its extreme outermost position, the detent I6 is in registry with the circumferential groove I8. When the shackle is moved inwardly to compress the spring, the shorter leg i3 is rst turned to enter into the recess 9.

To hold the shackle in its depressed or locked position, it is formed with a pair of facing notches 2S and 21 so disposed as to cooperate in closed position of the lock with a pair of oppositely located pawls 2S and 2S respectively. The pawls are generally circular cylindrical in contour and are situated in a cross bore 3l extending into the body 6 and finally closed by a plug 32 suitably nished externally to match the body so that it is not readily visible. Each of the pawls 28 and 29 is like the other and is provided with an extended projection 33 bored to house a coil spring 3d interposed between the two pawls and tending to urge them apart or outwardly.

Each of the pawls is likewise provided at one end with a depending lug 36 disposed so "that when the pawls are in their outermost position Within the notches 26 and 21, the lugs 3B dene a central channel 31. When the pawls are extended as shown in Figure 1, it is impossible for the shackle I2 to be withdrawn from the body 6, but when the pawls are urged to ride over each other into their retracted position, as shown in Figure 2, then it is quite possible for the shackle to be withdrawn or to be projected by the spring I9. The shape of the pawls and of the notches is such that upon return movement of the shackle into its locked position the pawls under the urgency of the springs 34 engage in the notches and restore the locked condition.

In order appropriately to actuate the pawls, I provide a cylinder lock body 4I. This is preferably of a standard kind having a circular cylindrical plug 42 adapted to receive a turn key 43 and likewise having a tongue 44 at one end thereof rotatable upon rotation of the key 43. When the key is rotated, the tongue 44 likewise rotates and cams against the lugs 36 to retract the pawls.

So that the key may be appropriately tted and so that no other key can be equally effective, the circular cylindrical lock body 4I is likewise provided with a projecting combination extension 46.

Pursuant to my invention, I house the lock body 4I within the body B in a special fashion. For this purpose, a pair of parallel intersecting bores 41 and 48 begin or open on the lower face 8 and extend part way through the body Ii. The axes of the bores 41 and 48 are not only parallel to each other but are parallel also to the axes of the recesses 9 and II. The axis of the bore 48 is substantially on the center line of the body E Whereas the axis of the bore 41 is located so that the bore merges with the recess 9 to leave a projecting shoulder 5I in the material of the body 6.

To receive and retain the combination projection 45 of the lock, I provide a generally hollow circular cylindrical shell 52 (Figure 6) having a closed bottom 53 and having a lateral opening 54 in one side thereof. A cap 56 closes one end of the shell, being retained in position by a locking ring 51 in part seated in a groove 58 in the cap and in part seated in a groove 59 on the interior of the shell itself. The cross-sectional contour of the shell and the cross-sectional contour of the lock body 4I are such that when the combination extension 46 is passed through the opening 54 into the interior of the shell, their combined coniiguration in cross-section is substantially the same as that of the cross-sectional conguration of the combined bores 41 and 48.

When the shell and the lock body 4I are simultaneously and in assembled condition introduced through the openings in the lower face 8 of the lock body 6, they can be forced inwardly until the tongue 44 lies between the lugs 36 and the cap 56 is disposed in close abutment with the shoulder 5I. Then, when the shackle i2 is in its unlocked or open position and is rotated to one side, a fastening bolt 62 is passed through the recess 9 and is screwed into a threaded central hole 63 in the cap 56. When the screw is tightened, it is itself forced against the shoulder 5I in the body and also pulls the cap 55 and with it the shell` 52 tightly into engagement within the body shoulder 5I and so holds the lock body 4I not only against rotation but also against axial withdrawal. When the 4 shackle I2 is subsequently pressed into position and locked, the shorter leg I3 thereof is engaged by the pawl 28 and overlies the fastening bolt 62 thus preventing access thereto.

When the lock is to be disassembled, the key 43 is rst turned to release the shackle I2, whereupon a screw driver is inserted through the recess 9, displacing the pawl 28 inwardly if necessary, and is engaged with the fastening bolt B2. If the lock is 'designed to be disassembled at that point, the friction between the cap 5B and the shell 52 is such that the cap remains stationary while the fastening bolt 62 is unscrewed. The bolt can then be withdrawn from the body 6. If it is desired that after primary assembly the lock cannot be readily disassembled, it is easy to provide that even though a screw driver may be engaged With the fastening bolt S2, rotation of such bolt will be of no avail. That is accomplished by making the relative friction between the cap 56 and the shell 52 so light that rotation of the bolt produces a simultaneous and corresponding rotation of the cap 56 so that the bolt cannot be unscrewed. The lock then cannot be disassembled by any such means.

What is claimed is:

l. A padlock comprising a body having a recess therein and having a pair of communicating bores, a shell having a lateral opening therein and disposed in one of said bores, a shackle portion mounted for movement with respect to said body and into and out of said recess, a lock disposed in the other of said bores for controlling the movement of said shackle portion, a projection on said lock extending through said opening into said shell, and a fastener in said body releasably secured to said shell and body for holding said lock in said body and accessible through said recess for release thereof from said shell and body.

2. In a padlock which includes a body having a pair of parallel recesses adapted to receive the ends of a shackle therein, a pair of parallel intersecting bores formed in said body and providing in cross section a predetermined configuration with one of said bores merging with one of said recesses to leave an intervening shoulder, said shoulder being provided with a bolt receiving hole therethrough, a shell having a lateral opening therein, a lock having a projection thereon extending through said opening into said shell, said shell and said lock providing in cross section substantially said predetermined conguration and being disposed within said bores, and a bolt accessible through said one recess extending through said hole in said shoulder and threadedly engaging said shell in said one bore for drawing the head of said bolt and said shell against said shoulder.

3. Locking means for use with a padlock having a body formed with a recess adapted to receive one end of a shackle therein, said locking means comprising: a lock having a projection thereon and a shell formed with an opening in which said projection is received, said shell and lock being adapted to be received in a socket on the side of said body opposite said recess when said projection is received in said opening, a fastener removably received in said shell and engageable with the bottom of said recess for securing said shell to said body to prevent removal of said lock.`

4. A lock mounting device for use with a padlock having a body formed with a recess in one side thereof and adapted to receive one end of a shackle therein and a lock socket on the other side of said body for receiving a lock, said device comprising: a tubular cylindrical shell adapted to be received in a complementarily formed bore opening outwardly of the other side of said body and communicating with said socket, a fastening element releasably received in one end of said shell and engageable with the bottom of said recess for holding said shell in said body, said fastening element being actuatable through said recess when said one end of said shackle is removed therefrom and when said shell is received in said bore, said shell being formed along one side with a radially outwardly opening slot adapted to receive the combination extension of a lock whereby said shell and said lock may be inserted as a unit into said body with said shell received in said bore and said lock received in said socket.

5. A padlock comprising a body formed with a recess on one side thereof and adapted to receive oneend of a shackle therein, a pair of rst and second parallel bores opening outwardly of the opposite side thereof and communicating with each other, an elongated lock having a lateral projection thereon, a generally cylindrical shell provided with an axially extending slot along one side thereof receiving said projection therethrough whereby said shell and said lock are positioned in said first and second bores respectively, said shell being provided with an integral outer end and an opposite inner end adapted to be positioned adjacent the bottom of said recess, a screw actuatable through said recess and extending through the portion of the body which separates said recess and said rst bore for releasably securingl the inner end of said shell to said body thereby securing said lock within said body against removal therefrom.

6. A padlock comprising a body formed with a recess on one side thereof and adapted to receive one end of a shackle therein, a pair of first and second parallel bores opening out- 6 wardly of the opposite side thereof and coinmunicating with each other, an elongated lock having a lateral projection thereon, a generally cylindrical shell provided with an axially extending slot along one side thereof receiving said projection therethrough whereby said shell and said lock are positioned in said rst and second bores respectively, said shell being provided with an integral outer end and an opposite inner end adapted to be positioned adjacent thebottom of said recess, a screw actuatable through said recess and extending through the portion of the body which separates said recess and said first bore for releasably securing the inner end of said shell to said body thereby securing said lock within said body against removal therefrom, said inner end being freely rotatable on said shell to normally prevent rotation of said screw relative to said inner end.

7. A padlock comprising a body having a recess therein and having a pair of communicating bores therein, a shell having a lateral opening therein and disposed in one of said bores, a lock received in the other of said bores and having a portion extending through said opening into said shell, a fastener accessible through said recess and releasably securing said body and said shell together for releasably securing said lock within said body, a shackle mounted on said body to move into a position overlying said fastener to block access thereto, releasable means on said body for holding said shackle in said position, and means controlled by said lock for actuating said releasable means.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,093,080 Shipman Apr. 14, 1914 1,660,903 Adamson Feb. 28, 1928 1,779,716 Shaw Oct. 28, 1930 1,824,301 Russell Sept. 22, 1931 2,489,484 Dayson Nov. 29, 1949

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